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Possible Duplicate:
Is deriving square from rectangle a violation of Liskov's Substitution Principle?
By applying the LSP, can anyone give me an implementation of Square and Rectangle?
I have read the book – “Head First Object-Oriented Analysis and Design”, they said if Sqaure inherit from Rectangle, it violated the LSP but does not have a proper implementation.
Anyone want a try?
If you make Square and Rectangle immutable, then you won’t violate LSP.
The issue is if you can independently change the width and height of a Rectangle, and a Square is a Rectangle, then you can change a Square to not be a square.